The raw materials— tin, tantalum, tungsten and gold—were dubbed “conflict minerals.”
tungsten, tantalum, tin and gold are used to produce many common consumer electronics devices.
The Mojave is rich with silver, tungsten, gold, and iron deposits.
And when you review the periodic table, take special note of tungsten, or Wolfram.
In China, for example, tungsten, tantalum, tin and gold are mined and ore is imported from other countries.
The first tungsten lamps appeared on the market in 1906, but these contained fragile filaments made by the squirting process.
There are two styles in common use, the carbon and the tungsten lamp.
How many candle power should a 20-watt tungsten lamp give if its efficiency is one watt per candle power?
tungsten is a heavy metal, but its properties are not much known.
It's an eighteen-inch beam—and now the energy is just sufficient to heat that tungsten plate to bright red.
rare metallic element, 1796, from Swedish tungsten "calcium tungstate," coined by its discoverer, Swedish chemist Karl Wilhelm Scheele (1742-1786) from tung "heavy" + sten "stone." Used earlier as the name for calcium tungstate (1770). Atomic symbol W is from Latin wolframium, from German Wolfram "iron tungstate" (see wolfram).
tungsten tung·sten (tŭng'stən)
A hard brittle corrosion-resistant metallic element having the highest melting point of any metal and used in high-temperature structural materials and in electrical elements, notably lamp filaments. Atomic number 74; atomic weight 183.85; melting point 3,422°C; boiling point 5,555°C; specific gravity 19.3 (20°C); valence 2, 3, 4, 5, 6. Also called wolfram.
A hard, gray to white metallic element that is very resistant to corrosion. It has the highest melting point of all elements, and it retains its strength at high temperatures. It is used to make light-bulb filaments and to increase the hardness and strength of steel. Atomic number 74; atomic weight 183.84; melting point 3,410°C; boiling point 5,900°C; specific gravity 19.3 (20°C); valence 2, 3, 4, 5, 6. Also called wolfram. See Periodic Table.